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- Warren Buffett's Berkshire Hathaway sold about $6 billion of Chevron stock in the first quarter.
- Berkshire cashed out about 35 million shares, or 20% of its stake in the oil titan, earnings show.
- Buffett's company may have sold shares in Taiwan Semiconductor and two US banks, one analyst said.
Warren Buffett's Berkshire Hathaway sold an estimated $6 billion worth of Chevron stock last quarter, its earnings report revealed on Saturday.